Ten World Engineering Marvels-- Part 4: Netherlands and Da Subways

9.  NETHERLANDS NORTH SEA PROTECTION WORKS

With parts of their country below sea level, a system of floodgates, storm surge barriers and dams to prevent flooding and claim land from the sea, Netherlands constructed this.

The project began in 1927 with the construction of a 19-mile long dike, decades of land reclamation followed.

10.  NEW YORK AND BOSTON SUBWAYS

Horse-drawn carriages clogged the streets (and left behind certain droppings) and then there were the elevated trains with their soot, so leaders in Boston and New York took another way to solve the problem.  And that was to go underground.

Boston opened its subway in 1897 and New York City  seven years later.

--CootSubs